拜耳法氧化铝生产过程中锂的富集机制研究

研究了拜耳法氧化铝生产过程中锂的富集机制。结果表明,在拜耳法氧化铝生产工艺中,铝土矿中约有80%金属锂在高压溶出过程中以铝酸锂的形式进入铝酸钠溶液,后经晶种分解全部进入结晶氢氧化铝中,在氢氧化铝的高温煅烧过程中,因升华作用损失约25%的金属锂,其余以氧化物形式富集在氧化铝制品中,其含量随着入磨铝土矿中金属锂含量的增加而增加、随铝土矿A/S比的增加而降低。     

帘线钢中氮含量对TiN析出的影响

 研究了攀钢新钢钒公司生产帘线钢72A过程中钢中氮含量变化对钢中TiN夹杂析出的影响。研究发现,随着钢中氮含量的升高,钢中析出的TiN夹杂数量变多,尺寸变大。热力学研究表明,在帘线钢中TiN一般只能在固相区形成,考虑元素偏析对凝固前沿元素富集的影响,凝固过程中TiN能在固液两相区析出。在帘线钢生产过程中,为了控制钢中TiN的析出,除了控制钛含量,控制钢中氮含量及氮偏析更加重要。理论计算结果表明,当钢中钛的质量分数控制在0.0003%~0.0005%区间时,将钢中氮的质量分数控制在0.0017%~0.0029%区间内能显著降低乃至杜绝帘线钢中TiN的析出。攀钢将帘线钢中钛、氮的质量分数分别控制在0.0005%以下和0.002%以下,显著减少了钢中TiN的析出,个别炉次中没有发现尺寸大于2μm的TiN夹杂。     

苏轼词中的醉酒体验

中国文人身上,自古就有着浓厚的醉酒情结,在苏轼的身上这种情结也很明显.苏轼的词中大量涉及醉酒意象,苏轼在醉酒体验中时常进入癫狂状态,在癫狂中尽情地宣泄情感,并在痛苦与狂喜的交织中顿悟人生,复归自然.本文从苏轼词中的醉酒意象入手,探讨苏轼醉酒词背后的情感体验,探寻苏轼醉酒词中透视的癫狂状态,在癜狂中本真的宣泄真我,在喜与悲中顿悟的情感历程.     

串联罐式喷煤系统称重传感器的补偿研究

以唐钢炼铁厂三号(2560m3 )高炉喷煤系统为研究对象。针对喷煤系统在中罐及软连接充压过程中,中、下罐电子秤显示不准的问题进行了研究,并根据喷煤系统设备的实际状况,提出了一种新的解决方案,即以建立喷煤量控制的数学模型为基础,计算喷煤过程中喷煤量的补偿量,并返算出喷煤过程中中、下罐煤粉的瞬时重量,作为电子秤的显示值,从而解决了由于充压导致的中罐“上浮”的问题。     

微库仑法测定氧化镁中痕量硫

微库仑技术是一种快速、灵敏而准确的分析方法,国内已广泛用于环保及石油产品中痕量硫的测定,近年来,又成功的用于钢铁及纯铁中痕量硫的测定,其检测下限为0.0001%.用微库仑法测定氧化镁中痕量硫是一种新的尝试.氧化镁作为碱性氧化物,易溶于酸中甚至乙酸中.经试验证明,氧化镁中硫主要以硫酸盐形式存在,因此,采用氢碘酸     

黄金氰化浸取液中硫氰酸根的测定

从黄铁矿废渣中回收金银,因渣中残硫的存在,在氰化处理过程中,部份残硫转化成硫氰酸盐。钝化了部份氰根对金银的氰化作用,因而硫氰酸盐的转化率为黄金冶炼所 重视。 目前氰化过程中硫氰酸盐的测定方法,文献报导甚少。本方法对氰化过程中贵液贫液中硫氰酸根离子测定,进行了一系列试验     

地质矿物中重金属元素异常信息提取方法研究

由于传统方法在地质矿物中重金属元素异常信息提取实际操作中,经常出现错提现象,且提取到的错误信息量较大,为此提出地质矿物中重金属元素异常信息提取方法研究。分析了地质矿物中重金属元素异常信息提取现状,了解到方法存在的问题,在此基础上设计地质矿物中重金属元素异常信息提取方法。根据元素的单质密度区别光谱测量仪测量到的重金属元素信息,获取到地质矿物中重金属元素信息;通过计算地质矿物中局部重金属元素密集系数,提取到地质矿物中重金属元素异常信息。经实验证明,采用设计方法提取到的错误地质矿物中重金属元素异常信息少于传统方法,具有较高的可靠性和可行性。     

小秦岭典型地段植物重金属污染特征分析

在研究区采集了132组植物样品,并对样品中As、Hg、Cu、Zn、Pb、Cd、Cr、Ni 8种重金属含量进行了测试,采用环境指数作为植物重金属污染评价方法来描述受污染程度,得出了不同种类植物的重金属污染状况。通过对比分析富集系数,研究了重金属在植物中的富集特征。其研究结果表明:不同植物中重金属含量超标倍数和吸收量明显不同,显示出选择性富集特征。该次采集的所有植物中As、Hg的含量都不超标;红薯中Cd和Pb的含量超标倍数最高,玉米中Zn的含量超标倍数最高,Cu也比较容易在粮食作物中累积且以红薯最为突出;蔬菜中Pb、Cd、Zn的含量超标倍数最高,以白萝卜、白菜最为突出;水果中Pb的含量超标倍数最高,且苹果和柿子都较为突出。该次采集的植物对Pb的吸收能力都很强,只有玉米对Zn的吸收能力比其对Pb的吸收能力略强。受到重金属污染的土壤所种植的粮食、蔬菜和水果均有不同程度的富集,其对重金属吸收强弱的排序分别为:白菜、白萝卜和胡萝卜中,PbZnCuNiCrCdHgAs;红薯和茄子中,PbCuZnNiCrHgCdAs;南瓜和苹果中,PbCuZnNiCrHgAsCd;柿子中,PbNiCuZnCrHgAsCd;玉米中,ZnPbCuNiCrHgAsCd;西红柿中,PbZnCuNiCrAsCdHg。     

AE与3ds Max结合使用的两种方法

在涉及到三维元素的制作中我们通常会在三维软件中制作主体,渲染到后期软件中进行叠加背景、做特效、调整颜色等处理再进行输出,如何将三维中制作的元素结合到后期软件中使用是在实际工作中经常遇到的问题,下文就使用在国内包装领域中使用最广泛的3ds Max和After Effects(以下简称AE)来介绍两者结合使用的方法.     

PLC技术在焦炉脱硫脱硝工段中的应用

焦化过程中焦炉烟气中氮氧化物的重要来源是燃烧室高温引起的氮氧化学反应。氮氧化物和其他物质的生产。因为焦炉燃烧室内产生的氮氧化物无法避免,只能通过外部措施对焦炉烟气中氮氧化物进行脱硝处理,达到排放要求;同时由于焦炉煤气中含有二氧化硫等含硫物质,造成焦炉烟气中硫化物含量较高,导致焦炉烟气中二氧化硫排放不达标,需要进行脱硫处理。     

Processing instructional texts and examples.

72 undergraduates used 1 of 4 formats of instructional information to solve series completion problems, and processing of instructional information and test performance were assessed. Direct retrieval of a procedure with an instructional text was most successful when the name of the procedure was provided, rather than the component steps. Analogical processing was used when an example was given. When inferring a rule and mapping the example rule on to the test items, Ss looked back at the example more often than at the instructional text. Practice effects were most evident for Ss given an example, suggesting that the example but not the instruction procedure was being modified in the course of the test. An appendix of problems used on the computer test is included. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

钢瓶热载体烤漆炉热负荷计算

对钢瓶热载体烤漆炉热负荷的影响因素进行了分析探讨,初步提出了其热负荷计算公式。通过计算实例,说明了影响烤漆炉热负荷的主要因素。     

Comparative study of xeroradiography and filmradiography (2700 statistically evaluated tests) (author's transl)

Bases on more than 2700 statistically evaluated, comparative filmradiographic thoracic organs, abdomen and vascular and lymphatic system, the value of xeroradiography was analyzed by a standardized process. We came to the conclusion that, in certain cases, xeroradiography is superior (example: head-neck-soft tissues), equal (example: cranial area) or inferior (example: abdomen) to conventional X-ray film techniques. The xeroradiographic procedure has advantages for the radiologist if he does not try to use it as a substitute for the conventional X-ray film technique.     

沥青混凝土格栅层在城市水泥路面改造中的应用

以贵溪市建设大道、站前路、雄石路改造为例，介绍玻璃纤维格栅的技术性能指标及其施工工艺，旧路面防治处理，分析加铺沥青混凝土格栅层路面路用性能改善分析。     

Differential exposure misclassification in case-control studies of environmental tobacco smoke and lung cancer

We review some of the literature on the effects of exposure misclassification on the statistical analysis of case-control studies. In particular, we focus on evidence for exposure misclassification which may be different for cases and controls in studies of environmental tobacco smoke (ETS). For example, such misclassification could induce relative risk estimates below unity for low exposure which appears to be the case in U.S. lung cancer and ETS studies. We describe procedures for systematically examining the sensitivity of dose-response statistics on exposure misclassification. The procedures demonstrate how p-values for the null hypothesis of no dose-response trend could be adjusted to account for exposure misclassification. The adjustment procedures were applied to an example based on a recently published large study of ETS and lung cancer in which a p-value for trend was reported as 0.03. In this example it is seen that modest differential exposure misclassification can induce substantial increases in the actual p-value, changing what appears to be statistically significant to decidedly nonsignificant.     

浅谈南坪快速路道路照明设计

通过南坪快速路道路照明设计实例，介绍快速路道路照明设计方法和主要内容。     

Reading skill as a source of individual differences in the processing of instructional texts.

Evidence was found in support of the hypothesis that skilled readers are more likely than less skilled readers to successfully retrieve an appropriate procedure by reading an instructional text. Subjects completed a standardized reading comprehension test and a test designed to reflect their processing of an instructional text and an example. The instructional text and the example either described the same procedure for answering test items (no conflict) or described different and mutually exclusive procedures (conflict). Subjects who had higher scores on the reading test were more likely to notice the conflict between the instructional text and the example, and those who noticed the conflict were more likely to use the instructional text. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于VB的晶粒长大的蒙特卡罗模拟

介绍正常晶粒长大的一般规律及其常用方法——蒙特卡罗方法．并采用VB语言编写了模拟正常晶粒长大的仿真系统．最后通过一算例获取了晶粒长大演变及晶粒尺寸随时问变化的关系．该算例说明了蒙特卡罗方法在模拟晶粒长大方面的直观性和有效性。     

Counterfactual and Prefactual Conditionals.

We consider reasoning about prefactual possibilities in the future, for example, "if I were to win the lottery next year I would buy a yacht" and counterfactual possibilities, for example, "if I had won the lottery last year, I would have bought a yacht." People may reason about indicative conditionals, for example, "if I won the lottery I bought a yacht" by keeping in mind a few true possibilities, for example, "I won the lottery and I bought a yacht." They understand counterfactuals by keeping in mind two possibilities, the conjecture, "I won the lottery and I bought a yacht" and the presupposed facts, "I did not win the lottery and I did not buy a yacht." We report the results of three experiments on prefactuals that examine what people judge them to imply, the possibilities they judge to be consistent with them, and the inferences they judge to follow from them. The results show that reasoners keep a single possibility in mind to understand a prefactual. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The arena test and cortisol response of sheep as indirect selection criteria for the improvement of lamb survival

Manias, and particularly depressions, are syndromes not disease. Considerable data support the fact that depressions, though similar clinically, are of heterogeneous etiologies. We can separate depressions generally into those that are endogenous/psychotic and those that occur in the context of marked emotional instability. Familial pure depressive disease is a specific example of the former, depression spectrum diseases a specific example of the latter. These are separable on the basis of personality, clinical, follow-up, familial and treatment variables.